Chapter 7 Aquatic Ecosystems

lake that has a large amount of plant growth due to nutrients

organisms that float near the surface of water

marine ecosystem dominated by trees with stilt-like roots

factor that determines where aquatic organisms live

threat to ocean organisms

marine ecosystem dominated by marsh grasses

bottom of a pond or lake

use stinging tentacles to capture prey

environmental function of wetlands

threat to river ecosystems

Which of the following is not an environmental function of wetlands? a. increasing runoff b. absorbing and removing pollutants from water c. trapping carbon that would otherwise be released into the air d. controlling floods

Which of the following factors is not an important advantage for aquatic organisms living near the surface of a lake or pond? a. warmer temperature b. more sunlight c. presence of decomposing organisms d. higher oxygen level

Which of the following is not characteristic of salt marshes and mangrove swamps? a. Both provide habitats for wildlife. b. Both are dominated by marsh grasses. c. Both are found along coastal areas. d. Both are threatened by development.

Photosynthetic organisms are found mainly in shallow water due to the availability of a. oxygen. b. nutrients. c. sunlight. d. salt.

In the _________ zone, aquatic life is diverse and abundant. a. benthic c. littoral b. eutrophic d. plankton

In the _________ zone, the water is cool and dark. a. benthic c. littoral b. eutrophic d. plankton

Which of the following is not a threat to coral reefs? a. oil spills b. sewage c. pesticides d. phytoplankton

Estuaries are extremely productive ecosystems because they continually receive fresh nutrients from _________ and _________. a. rivers, oceans b. lakes, ponds c. marshes, swamps d. streams, springs

What causes most coastal pollution in the United States? a. lakes and ponds b. industrial waste and sewage c. over fishing d. temperature changes

As they flow down a mountain to flatter ground, rivers generally become a. wider. b. warmer. c. slower. d. All of the above